Fears a new conflict may erupt in the Middle East skyrocketed on Sunday, as it emerged hundreds of US military personnel had been relocated at a major military base in Qatar. Tensions between the US and Iran have been ramping up in recent weeks, as Donald Trump have been threatening Tehran to agree to a nuclear deal or face US strikes similar to those launched last summer to its nuclear facilities.

U.S. officials told ABC News they are relocating hundreds of personnel at a major military base in Qatar ahead of a possible strike. The two countries continue to carry out negotiations over Tehran’s nuclear program. Alongside those talks, ABC said, the U.S. has amassed a major military buildup in the Middle East, including aircraft carriers and fighter jets. There’s a total of 35,000 U.S. forces in the region, ABC also added.

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The U.S., Trump said, “may have to take it a step further” on the matter of striking Iran, but he then added, “we may not.”

“You’re going to be finding out over the next probably 10 days,” Trump said speaking at the initial meeting of the U.S.-led Board of Peace. The USS Gerald R Ford aircraft carrier is currently in the Mediterranean Sea, and recently moved other military assets into the Middle East.

A military conflict would also impact the cost of oil. Iran accounts for less than 3% of global oil output, according to the EIA, but the country’s sales of oil have been affected by sanctions. On Tuesday, in order to allow live fire military drills, Iran closed the Strait of Hormuz, which is a route that accounts for about 20% of the global oil supply.

A potential conflict could prompt the closure of the Strait of Hormuz, driving up prices for oil and other goods, experts previously told ABC News.